20122705321 has 2 divisors, whose sum is σ = 20122705322. Its totient is φ = 20122705320.

The previous prime is 20122705319. The next prime is 20122705409. The reversal of 20122705321 is 12350722102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12903824025 + 7218881296 = 113595^2 + 84964^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122705321 - 2¹ = 20122705319 is a prime.

Together with 20122705319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20122705301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061352660 + 10061352661.

It is an arithmetic number, because the mean of its divisors is an integer number (10061352661).

Almost surely, 2^20122705321 is an apocalyptic number.

It is an amenable number.

20122705321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122705321 is an equidigital number, since it uses as much as digits as its factorization.

20122705321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The spelling of 20122705321 in words is "twenty billion, one hundred twenty-two million, seven hundred five thousand, three hundred twenty-one".